When seventeen-year-old Mika moves out to live independently in Tokyo, she meets an unwanted guest, sleeping in the living room. It's a mysterious handsome man with his unnatural black and white color body. At first Mika was suspicious and wants him out of 'her' apartment but slowly, she feels an attraction towards him and realizes he's not wholly human nor alive. No human would look like that. She began to look into the man's background, slowly revealing the dark truth of who he is and why he lives with her.